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Automated Multiscale Approach To Predict Self-Diffusion from a Potential Energy Field
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK). Ecole Polytechnique Fédéralede Lausanne (EPFL), Switzerland.ORCID iD: 0000-0002-0323-0210
Number of Authors: 32019 (English)In: Journal of Chemical Theory and Computation, ISSN 1549-9618, E-ISSN 1549-9626, Vol. 15, no 4, p. 2127-2141Article in journal (Refereed) Published
Abstract [en]

For large-scale screening studies there is a need to estimate the diffusion of gas molecules in nanoporous materials more efficiently than (brute force) molecular dynamics. In particular for systems with low diffusion coefficients molecular dynamics can be prohibitively expensive. An alternative is to compute the hopping rates between adsorption sites using transition state theory. For large-scale screening this requires the automatic detection of the transition states between the adsorption sites along the different diffusion paths. Here an algorithm is presented that analyzes energy grids for the moving particles. It detects the energies at which diffusion paths are formed, together with their directions. This allows for easy identification of nondiffusive systems. For diffusive systems, it partitions the grid coordinates assigned to energy basins and transitions states, permitting a transition state theory based analysis of the diffusion. We test our method on CH4 diffusion in zeolites, using a standard kinetic Monte Carlo simulation based on the output of our grid analysis. We find that it is accurate, fast, and rigorous without limitations to the geometries of the diffusion tunnels or transition states.

Place, publisher, year, edition, pages
2019. Vol. 15, no 4, p. 2127-2141
National Category
Chemical Sciences Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-168639DOI: 10.1021/acs.jctc.8b01255ISI: 000464475500003PubMedID: 30811190OAI: oai:DiVA.org:su-168639DiVA, id: diva2:1313831
Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-05-06Bibliographically approved

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